| #ifndef _LINUX_SYSV_FS_H |
| #define _LINUX_SYSV_FS_H |
| |
| /* |
| * The SystemV/Coherent filesystem constants/structures/macros |
| */ |
| |
| |
| /* This code assumes |
| - sizeof(short) = 2, sizeof(int) = 4, sizeof(long) = 4, |
| - alignof(short) = 2, alignof(long) = 4. |
| */ |
| |
| #ifdef __GNUC__ |
| #define __packed2__ __attribute__ ((packed, aligned(2))) |
| #else |
| #error I want gcc! |
| #endif |
| |
| #include <linux/stat.h> /* declares S_IFLNK etc. */ |
| #include <linux/sched.h> /* declares wake_up() */ |
| #include <linux/sysv_fs_sb.h> /* defines the sv_... shortcuts */ |
| |
| |
| /* Layout on disk */ |
| /* ============== */ |
| |
| static inline u32 PDP_swab(u32 x) |
| { |
| #ifdef __LITTLE_ENDIAN |
| return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); |
| #else |
| #ifdef __BIG_ENDIAN |
| return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8); |
| #else |
| #error BYTESEX |
| #endif |
| #endif |
| } |
| |
| /* inode numbers are 16 bit */ |
| |
| typedef u16 sysv_ino_t; |
| |
| /* Block numbers are 24 bit, sometimes stored in 32 bit. |
| On Coherent FS, they are always stored in PDP-11 manner: the least |
| significant 16 bits come last. |
| */ |
| |
| typedef u32 sysv_zone_t; |
| |
| /* Among the blocks ... */ |
| /* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block. |
| SystemV FS: block 0 contains both the boot sector and the super-block. */ |
| /* The first inode zone is sb->sv_firstinodezone (1 or 2). */ |
| |
| /* Among the inodes ... */ |
| /* 0 is non-existent */ |
| #define SYSV_BADBL_INO 1 /* inode of bad blocks file */ |
| #define SYSV_ROOT_INO 2 /* inode of root directory */ |
| |
| |
| /* Xenix super-block data on disk */ |
| #define XENIX_NICINOD 100 /* number of inode cache entries */ |
| #define XENIX_NICFREE 100 /* number of free block list chunk entries */ |
| struct xenix_super_block { |
| u16 s_isize; /* index of first data zone */ |
| u32 s_fsize __packed2__; /* total number of zones of this fs */ |
| /* the start of the free block list: */ |
| u16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ |
| u32 s_free[XENIX_NICFREE]; /* first free block list chunk */ |
| /* the cache of free inodes: */ |
| u16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ |
| sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ |
| /* locks, not used by Linux: */ |
| char s_flock; /* lock during free block list manipulation */ |
| char s_ilock; /* lock during inode cache manipulation */ |
| char s_fmod; /* super-block modified flag */ |
| char s_ronly; /* flag whether fs is mounted read-only */ |
| u32 s_time __packed2__; /* time of last super block update */ |
| u32 s_tfree __packed2__; /* total number of free zones */ |
| u16 s_tinode; /* total number of free inodes */ |
| s16 s_dinfo[4]; /* device information ?? */ |
| char s_fname[6]; /* file system volume name */ |
| char s_fpack[6]; /* file system pack name */ |
| char s_clean; /* set to 0x46 when filesystem is properly unmounted */ |
| char s_fill[371]; |
| s32 s_magic; /* version of file system */ |
| s32 s_type; /* type of file system: 1 for 512 byte blocks |
| 2 for 1024 byte blocks |
| 3 for 2048 byte blocks */ |
| |
| }; |
| |
| /* SystemV FS comes in two variants: |
| * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). |
| * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). |
| */ |
| #define SYSV_NICINOD 100 /* number of inode cache entries */ |
| #define SYSV_NICFREE 50 /* number of free block list chunk entries */ |
| |
| /* SystemV4 super-block data on disk */ |
| struct sysv4_super_block { |
| u16 s_isize; /* index of first data zone */ |
| u16 s_pad0; |
| u32 s_fsize; /* total number of zones of this fs */ |
| /* the start of the free block list: */ |
| u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
| u16 s_pad1; |
| u32 s_free[SYSV_NICFREE]; /* first free block list chunk */ |
| /* the cache of free inodes: */ |
| u16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
| u16 s_pad2; |
| sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
| /* locks, not used by Linux: */ |
| char s_flock; /* lock during free block list manipulation */ |
| char s_ilock; /* lock during inode cache manipulation */ |
| char s_fmod; /* super-block modified flag */ |
| char s_ronly; /* flag whether fs is mounted read-only */ |
| u32 s_time; /* time of last super block update */ |
| s16 s_dinfo[4]; /* device information ?? */ |
| u32 s_tfree; /* total number of free zones */ |
| u16 s_tinode; /* total number of free inodes */ |
| u16 s_pad3; |
| char s_fname[6]; /* file system volume name */ |
| char s_fpack[6]; /* file system pack name */ |
| s32 s_fill[12]; |
| s32 s_state; /* file system state: 0x7c269d38-s_time means clean */ |
| s32 s_magic; /* version of file system */ |
| s32 s_type; /* type of file system: 1 for 512 byte blocks |
| 2 for 1024 byte blocks */ |
| }; |
| |
| /* SystemV2 super-block data on disk */ |
| struct sysv2_super_block { |
| u16 s_isize; /* index of first data zone */ |
| u32 s_fsize __packed2__; /* total number of zones of this fs */ |
| /* the start of the free block list: */ |
| u16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
| u32 s_free[SYSV_NICFREE]; /* first free block list chunk */ |
| /* the cache of free inodes: */ |
| u16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
| sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
| /* locks, not used by Linux: */ |
| char s_flock; /* lock during free block list manipulation */ |
| char s_ilock; /* lock during inode cache manipulation */ |
| char s_fmod; /* super-block modified flag */ |
| char s_ronly; /* flag whether fs is mounted read-only */ |
| u32 s_time __packed2__; /* time of last super block update */ |
| s16 s_dinfo[4]; /* device information ?? */ |
| u32 s_tfree __packed2__; /* total number of free zones */ |
| u16 s_tinode; /* total number of free inodes */ |
| char s_fname[6]; /* file system volume name */ |
| char s_fpack[6]; /* file system pack name */ |
| s32 s_fill[14]; |
| s32 s_state; /* file system state: 0xcb096f43 means clean */ |
| s32 s_magic; /* version of file system */ |
| s32 s_type; /* type of file system: 1 for 512 byte blocks |
| 2 for 1024 byte blocks */ |
| }; |
| |
| /* V7 super-block data on disk */ |
| #define V7_NICINOD 100 /* number of inode cache entries */ |
| #define V7_NICFREE 50 /* number of free block list chunk entries */ |
| struct v7_super_block { |
| u16 s_isize; /* index of first data zone */ |
| u32 s_fsize __packed2__; /* total number of zones of this fs */ |
| /* the start of the free block list: */ |
| u16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ |
| u32 s_free[V7_NICFREE]; /* first free block list chunk */ |
| /* the cache of free inodes: */ |
| u16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ |
| sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ |
| /* locks, not used by Linux or V7: */ |
| char s_flock; /* lock during free block list manipulation */ |
| char s_ilock; /* lock during inode cache manipulation */ |
| char s_fmod; /* super-block modified flag */ |
| char s_ronly; /* flag whether fs is mounted read-only */ |
| u32 s_time __packed2__; /* time of last super block update */ |
| /* the following fields are not maintained by V7: */ |
| u32 s_tfree __packed2__; /* total number of free zones */ |
| u16 s_tinode; /* total number of free inodes */ |
| u16 s_m; /* interleave factor */ |
| u16 s_n; /* interleave factor */ |
| char s_fname[6]; /* file system name */ |
| char s_fpack[6]; /* file system pack name */ |
| }; |
| |
| /* Coherent super-block data on disk */ |
| #define COH_NICINOD 100 /* number of inode cache entries */ |
| #define COH_NICFREE 64 /* number of free block list chunk entries */ |
| struct coh_super_block { |
| u16 s_isize; /* index of first data zone */ |
| u32 s_fsize __packed2__; /* total number of zones of this fs */ |
| /* the start of the free block list: */ |
| u16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ |
| u32 s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ |
| /* the cache of free inodes: */ |
| u16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ |
| sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ |
| /* locks, not used by Linux: */ |
| char s_flock; /* lock during free block list manipulation */ |
| char s_ilock; /* lock during inode cache manipulation */ |
| char s_fmod; /* super-block modified flag */ |
| char s_ronly; /* flag whether fs is mounted read-only */ |
| u32 s_time __packed2__; /* time of last super block update */ |
| u32 s_tfree __packed2__; /* total number of free zones */ |
| u16 s_tinode; /* total number of free inodes */ |
| u16 s_interleave_m; /* interleave factor */ |
| u16 s_interleave_n; |
| char s_fname[6]; /* file system volume name */ |
| char s_fpack[6]; /* file system pack name */ |
| u32 s_unique; /* zero, not used */ |
| }; |
| |
| /* SystemV/Coherent inode data on disk */ |
| |
| struct sysv_inode { |
| u16 i_mode; |
| u16 i_nlink; |
| u16 i_uid; |
| u16 i_gid; |
| u32 i_size; |
| union { /* directories, regular files, ... */ |
| unsigned char i_addb[3*(10+1+1+1)+1]; /* zone numbers: max. 10 data blocks, |
| * then 1 indirection block, |
| * then 1 double indirection block, |
| * then 1 triple indirection block. |
| * Then maybe a "file generation number" ?? |
| */ |
| /* named pipes on Coherent */ |
| struct { |
| char p_addp[30]; |
| s16 p_pnc; |
| s16 p_prx; |
| s16 p_pwx; |
| } i_p; |
| } i_a; |
| u32 i_atime; /* time of last access */ |
| u32 i_mtime; /* time of last modification */ |
| u32 i_ctime; /* time of creation */ |
| }; |
| |
| /* Admissible values for i_nlink: 0.._LINK_MAX */ |
| enum { |
| XENIX_LINK_MAX = 126, /* ?? */ |
| SYSV_LINK_MAX = 126, /* 127? 251? */ |
| V7_LINK_MAX = 126, /* ?? */ |
| COH_LINK_MAX = 10000, |
| }; |
| |
| /* The number of inodes per block is |
| sb->sv_inodes_per_block = block_size / sizeof(struct sysv_inode) */ |
| /* The number of indirect pointers per block is |
| sb->sv_ind_per_block = block_size / sizeof(u32) */ |
| |
| |
| /* SystemV/Coherent directory entry on disk */ |
| |
| #define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ |
| |
| struct sysv_dir_entry { |
| sysv_ino_t inode; |
| char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ |
| }; |
| |
| #define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ |
| |
| |
| /* Operations */ |
| /* ========== */ |
| |
| /* identify the FS in memory */ |
| enum { |
| FSTYPE_NONE = 0, |
| FSTYPE_XENIX, |
| FSTYPE_SYSV4, |
| FSTYPE_SYSV2, |
| FSTYPE_COH, |
| FSTYPE_V7, |
| FSTYPE_AFS, |
| FSTYPE_END, |
| }; |
| |
| #define SYSV_MAGIC_BASE 0x012FF7B3 |
| |
| #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX) |
| #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4) |
| #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2) |
| #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH) |
| |
| #ifdef __KERNEL__ |
| |
| enum { |
| BYTESEX_LE, |
| BYTESEX_PDP, |
| BYTESEX_BE, |
| }; |
| |
| /* |
| * Function prototypes |
| */ |
| |
| extern struct inode * sysv_new_inode(const struct inode *, mode_t); |
| extern void sysv_free_inode(struct inode *); |
| extern unsigned long sysv_count_free_inodes(struct super_block *); |
| extern u32 sysv_new_block(struct super_block *); |
| extern void sysv_free_block(struct super_block *, u32); |
| extern unsigned long sysv_count_free_blocks(struct super_block *); |
| |
| extern void sysv_truncate(struct inode *); |
| |
| extern void sysv_write_inode(struct inode *, int); |
| extern int sysv_sync_inode(struct inode *); |
| extern int sysv_sync_file(struct file *, struct dentry *, int); |
| extern void sysv_set_inode(struct inode *, dev_t); |
| |
| extern struct sysv_dir_entry *sysv_find_entry(struct dentry*, struct page**); |
| extern int sysv_add_link(struct dentry*, struct inode*); |
| extern int sysv_delete_entry(struct sysv_dir_entry*, struct page*); |
| extern int sysv_make_empty(struct inode*, struct inode*); |
| extern int sysv_empty_dir(struct inode*); |
| extern void sysv_set_link(struct sysv_dir_entry*, struct page*, struct inode*); |
| extern struct sysv_dir_entry *sysv_dotdot(struct inode*, struct page**); |
| extern ino_t sysv_inode_by_name(struct dentry*); |
| |
| extern struct inode_operations sysv_file_inode_operations; |
| extern struct inode_operations sysv_dir_inode_operations; |
| extern struct inode_operations sysv_fast_symlink_inode_operations; |
| extern struct file_operations sysv_file_operations; |
| extern struct file_operations sysv_dir_operations; |
| extern struct address_space_operations sysv_aops; |
| extern struct super_operations sysv_sops; |
| extern struct dentry_operations sysv_dentry_operations; |
| |
| extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, struct buffer_head **); |
| |
| static inline void dirty_sb(struct super_block *sb) |
| { |
| mark_buffer_dirty(sb->sv_bh1); |
| if (sb->sv_bh1 != sb->sv_bh2) |
| mark_buffer_dirty(sb->sv_bh2); |
| sb->s_dirt = 1; |
| } |
| |
| static inline u32 fs32_to_cpu(struct super_block *sb, u32 n) |
| { |
| if (sb->sv_bytesex == BYTESEX_PDP) |
| return PDP_swab(n); |
| else if (sb->sv_bytesex == BYTESEX_LE) |
| return le32_to_cpu(n); |
| else |
| return be32_to_cpu(n); |
| } |
| |
| static inline u32 cpu_to_fs32(struct super_block *sb, u32 n) |
| { |
| if (sb->sv_bytesex == BYTESEX_PDP) |
| return PDP_swab(n); |
| else if (sb->sv_bytesex == BYTESEX_LE) |
| return cpu_to_le32(n); |
| else |
| return cpu_to_be32(n); |
| } |
| |
| static inline u32 fs32_add(struct super_block *sb, u32 *n, int d) |
| { |
| if (sb->sv_bytesex == BYTESEX_PDP) |
| return *n = PDP_swab(PDP_swab(*n)+d); |
| else if (sb->sv_bytesex == BYTESEX_LE) |
| return *n = cpu_to_le32(le32_to_cpu(*n)+d); |
| else |
| return *n = cpu_to_be32(be32_to_cpu(*n)+d); |
| } |
| |
| static inline u16 fs16_to_cpu(struct super_block *sb, u16 n) |
| { |
| if (sb->sv_bytesex != BYTESEX_BE) |
| return le16_to_cpu(n); |
| else |
| return be16_to_cpu(n); |
| } |
| |
| static inline u16 cpu_to_fs16(struct super_block *sb, u16 n) |
| { |
| if (sb->sv_bytesex != BYTESEX_BE) |
| return cpu_to_le16(n); |
| else |
| return cpu_to_be16(n); |
| } |
| |
| static inline u16 fs16_add(struct super_block *sb, u16 *n, int d) |
| { |
| if (sb->sv_bytesex != BYTESEX_BE) |
| return *n = cpu_to_le16(le16_to_cpu(*n)+d); |
| else |
| return *n = cpu_to_be16(be16_to_cpu(*n)+d); |
| } |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif |